Securities (Tables)

6 Months Ended

Jun. 30, 2020

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities Available for Sale

	June 30, 2020								December 31, 2019
			Gross		Gross				Gross		Gross
Securities Available for Sale	Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
(in thousands)	Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
U.S. Treasury and government agency securities	$	142,265	$	6,351	$	—	$	148,616	$	98,320	$	652	$	300	$	98,672
Municipal obligations		239,922		14,764		—		254,686		242,016		7,789		—		249,805
Residential mortgage-backed securities		2,007,247		70,089		13		2,077,323		1,910,909		20,268		7,020		1,924,157
Commercial mortgage-backed securities		1,726,091		132,398		—		1,858,489		1,570,765		19,880		4,178		1,586,467
Collateralized mortgage obligations		574,779		10,158		115		584,822		807,600		3,757		3,142		808,215
Corporate debt securities		8,000		225		19		8,206		8,000		21		33		7,988
	$	4,698,304	$	233,985	$	147	$	4,932,142	$	4,637,610	$	52,367	$	14,673	$	4,675,304

Amortized Cost and Fair Value of Debt Securities Held to Maturity

	June 30, 2020								December 31, 2019
			Gross		Gross				Gross		Gross
Securities Held to Maturity	Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
(in thousands)	Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
U.S. Treasury and government agency securities	$	—	$	—	$	—	$	—	$	50,000	$	3	$	—	$	50,003
Municipal obligations		624,717		43,718		16		668,419		641,019		27,146		69		668,096
Residential mortgage-backed securities		26,138		1,412		—		27,550		29,687		883		—		30,570
Commercial mortgage-backed securities		550,715		53,136		—		603,851		539,371		12,474		581		551,264
Collateralized mortgage obligations		248,091		5,682		—		253,773		307,932		3,597		458		311,071
	$	1,449,661	$	103,948	$	16	$	1,553,593	$	1,568,009	$	44,103	$	1,108	$	1,611,004

Available for Sale Securities [Member]

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

Debt Securities Available for Sale	Amortized		Fair
(in thousands)	Cost		Value
Due in one year or less	$	16,304	$	16,436
Due after one year through five years		179,035		191,064
Due after five years through ten years		1,874,212		2,006,374
Due after ten years		2,628,753		2,718,268
Total available for sale debt securities	$	4,698,304	$	4,932,142

Securities with Unrealized Losses

Available for Sale
June 30, 2020	Losses < 12 months				Losses 12 months or >				Total
(in thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
U.S. Treasury and government agency securities	$	—	$	—	$	—	$	—	$	—	$	—
Municipal obligations		—		—		—		—		—		—
Residential mortgage-backed securities		2,096		10		542		3		2,638		13
Commercial mortgage-backed securities		—		—		—		—		—		—
Collateralized mortgage obligations		47,153		115		—		—		47,153		115
Corporate debt securities		781		19		—		—		781		19
	$	50,030	$	144	$	542	$	3	$	50,572	$	147

Available for Sale
December 31, 2019	Losses < 12 months				Losses 12 months or >				Total
			Gross				Gross		Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(in thousands)	Value		Losses		Value		Losses		Value		Losses
U.S. Treasury and government agency securities	$	28,235		300	$	—	$	—	$	28,235	$	300
Municipal obligations		—		—		—		—		—		—
Residential mortgage-backed securities		420,066		5,042		399,787		1,978		819,853		7,020
Commercial mortgage-backed securities		458,855		3,971		14,896		207		473,751		4,178
Collateralized mortgage obligations		89,689		1,315		184,389		1,827		274,078		3,142
Corporate debt securities		1,467		33		—		—		1,467		33
	$	998,312	$	10,661	$	599,072	$	4,012	$	1,597,384	$	14,673

Held-to-maturity Securities [Member]

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

Debt Securities Held to Maturity	Amortized		Fair
(in thousands)	Cost		Value
Due in one year or less	$	2,199	$	2,191
Due after one year through five years		189,341		201,759
Due after five years through ten years		622,579		683,858
Due after ten years		635,542		665,785
Total held to maturity securities	$	1,449,661	$	1,553,593

Securities with Unrealized Losses

Held to maturity
June 30, 2020	Losses < 12 months				Losses 12 months or >				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(in thousands)	Value		Losses		Value		Losses		Value		Losses
U.S. Treasury and government agency securities	$	—	$	—	$	—	$	—	$	—	$	—
Municipal obligations		—		—		2,893		16		2,893		16
Residential mortgage-backed securities		—		—		—		—		—		—
Commercial mortgage-backed securities		—		—		—		—		—		—
Collateralized mortgage obligations		—		—		—		—		—		—
	$	—	$	—	$	2,893	$	16	$	2,893	$	16

Held to maturity
December 31, 2019	Losses < 12 months				Losses 12 months or >				Total
			Gross		Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(in thousands)	Value		Losses		Value		Losses		Value		Losses
U.S. Treasury and government agency securities	$	—	$	—	$	—	$	—	$	—	$	—
Municipal obligations		4,735		38		3,143		31		7,878		69
Residential mortgage-backed securities		—		—		—		—		—		—
Commercial mortgage-backed securities		28,426		581		—		—		28,426		581
Collateralized mortgage obligations		—		—		49,110		458		49,110		458
	$	33,161	$	619	$	52,253	$	489	$	85,414	$	1,108